On Fri, Dec 04, 2020 at 03:55:38PM +0500, Денис wrote: > My UPS wokrs uncorrectly. it appears and disappears in system after a few > seconds. help me > > Ubuntu 20.04 > 5.4.0-56-generic That is a Ubuntu-specific kernel release, based on a kernel from us from over a year ago. I strongly suggest you go get support from Ubuntu for this issue as only they know what is in that kernel, we have no idea. That being said: > > [ 2925.730918] usb 1-1.2: new low-speed USB device number 74 using ehci-pci > [ 2925.848395] usb 1-1.2: New USB device found, idVendor=0d9f, > idProduct=0004, bcdDevice= 0.02 > [ 2925.848402] usb 1-1.2: New USB device strings: Mfr=3, Product=1, > SerialNumber=2 > [ 2925.848405] usb 1-1.2: Product: HID UPS Battery > [ 2925.848409] usb 1-1.2: Manufacturer: POWERCOM Co.,LTD > [ 2925.848411] usb 1-1.2: SerialNumber: 004-0D9F-000 > [ 2925.894211] hid-generic 0003:0D9F:0004.01C3: hiddev0,hidraw2: USB HID > v1.00 Device [POWERCOM Co.,LTD HID UPS Battery] on > usb-0000:00:1a.0-1.2/input0 > [ 2929.604764] usb 1-1.2: USB disconnect, device number 74 This looks like your device keeps disconnecting and connecting to the system over and over. That's not something that the kernel can do on its own, are you sure this isn't a flaky cable or something like that? good luck! greg k-h
